This is very interesting, so I am jumping on board. Maybe we can get the discussion back onto this. It is very important, in my opinion to cull birds that are sick. The reason there is a huge problem is because people are too soft to deal with doin' what you have to do sometimes (cull), and they sell off birds to people with healthy flocks, where one sick bird multiplies to 25, and unless they cull, they also help to spread the disease.
I am awaiting test results to tell me the results of my little flock, which consists of breeders of Silver Grey Dorking, Silkies, lavender guinea, Ameraucana, 1 barred rock & one bourbon red turkey.
If results come back with a respiratory disease, I know what I must do. Depopulate & restart.
It's not fun for anyone, but it is our responsiblility once we decide to take on chickens.
And it's what all of you should also do unless you're going to keep an *all in* closed flock & practice *strict* bio-security measures to ensure any diseases your birds have stay on your property and doesn't spread to other flocks.
But most don't do that it seems, they are ill-informed so they only help to spread the disease. Ugghh.
It's so frustrating bc that's how my perfectly clean birds became infected. And this lady is still selling birds, even after I told her. Despicable.